On Wed, 2007-10-10 at 14:44 +0100, Tony Marston wrote:
> ""Nathan Nobbe"" <[EMAIL PROTECTED]> wrote in message
> news:[EMAIL PROTECTED]
> > On 10/9/07, Robert Cummings <[EMAIL PROTECTED]> wrote:
> >>
> >> On Tue, 2007-10-09 at 21:37 -0400, Nathan Nobbe wrote:
> >> >
> >> > does a lawn mower not have blades; and gas and a control panel; does it
> >> not
> >> > have
> >> > wheels? my object modeling of a lawn mower would certainly have these
> >> > things;
> >> > and most likely i would mark components of the engine as private.
> >> > and what does a lawn mower cut anyway; grass; i thought that was it.
> >> > so
> >> if
> >> > there
> >> > was no grass could there still be an algorithm to cut it?
> >> > i say grass is part of the grass-cutting algorithm.
> >>
> >> Well it helps to refine the algorithm, but let's say we use fingers
> >> instead as our measure... I'm sure we would find that we could cut grass
> >> also >:)
> >
> >
> > good point.
> > the lawn mower is still consistent of its own parts and they
> > comprise its implementation.
> >
> > -nathan
>
> Yes, but a lawnmower does not contain grass, it is used to cut grass. Whole
> grass goes in and cut grass comes out. The lawnmower does not have any grass
> in its construction, therefore grass is not part of the implementation.
It may not be part of it's construction, but it certainly is a member
variable. It's along the lines of the following:
<?php
class Lawnmower
{
var $works = true;
var $grassyMulchCrapStuckToUndersideOfLawnmower = 0;
function mow( $what )
{
if( !$this->works )
{
return false;
}
if( $what == 'grass' )
{
$this->grassyMulchCrapStuckToUndersideOfLawnmower +=
rand( 1, 100 );
if( $this->grassyMulchCrapStuckToUndersideOfLawnmower >
1000 )
{
return $this->seize();
}
}
else
if( $what == 'fingers' )
{
// >:)
}
return true;
}
function seize()
{
return ($this->works = false);
}
}
?>
Cheers,
Rob.
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